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2005-06-28 Paul Brook <paul@codesourcery.com>
[official-gcc.git] / gcc / rtl.h
blob72fe10a66a71472cb58480091c36f49c2e263324
1 /* Register Transfer Language (RTL) definitions for GCC
2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
20 02110-1301, USA. */
21
22 #ifndef GCC_RTL_H
23 #define GCC_RTL_H
24
25 #include "statistics.h"
26 #include "machmode.h"
27 #include "input.h"
28
29 #undef FFS /* Some systems predefine this symbol; don't let it interfere. */
30 #undef FLOAT /* Likewise. */
31 #undef ABS /* Likewise. */
32 #undef PC /* Likewise. */
33
34 /* Value used by some passes to "recognize" noop moves as valid
35 instructions. */
36 #define NOOP_MOVE_INSN_CODE INT_MAX
37
38 /* Register Transfer Language EXPRESSIONS CODES */
39
40 #define RTX_CODE enum rtx_code
41 enum rtx_code {
42
43 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
44 #include "rtl.def" /* rtl expressions are documented here */
45 #undef DEF_RTL_EXPR
46
47 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
48 NUM_RTX_CODE.
49 Assumes default enum value assignment. */
50
51 #define NUM_RTX_CODE ((int) LAST_AND_UNUSED_RTX_CODE)
52 /* The cast here, saves many elsewhere. */
53
54 /* Register Transfer Language EXPRESSIONS CODE CLASSES */
55
56 enum rtx_class {
57 /* We check bit 0-1 of some rtx class codes in the predicates below. */
58
59 /* Bit 0 = comparison if 0, arithmetic is 1
60 Bit 1 = 1 if commutative. */
61 RTX_COMPARE, /* 0 */
62 RTX_COMM_COMPARE,
63 RTX_BIN_ARITH,
64 RTX_COMM_ARITH,
65
66 /* Must follow the four preceding values. */
67 RTX_UNARY, /* 4 */
68
69 RTX_EXTRA,
70 RTX_MATCH,
71 RTX_INSN,
72
73 /* Bit 0 = 1 if constant. */
74 RTX_OBJ, /* 8 */
75 RTX_CONST_OBJ,
76
77 RTX_TERNARY,
78 RTX_BITFIELD_OPS,
79 RTX_AUTOINC
80 };
81
82 #define RTX_OBJ_MASK (~1)
83 #define RTX_OBJ_RESULT (RTX_OBJ & RTX_OBJ_MASK)
84 #define RTX_COMPARE_MASK (~1)
85 #define RTX_COMPARE_RESULT (RTX_COMPARE & RTX_COMPARE_MASK)
86 #define RTX_ARITHMETIC_MASK (~1)
87 #define RTX_ARITHMETIC_RESULT (RTX_COMM_ARITH & RTX_ARITHMETIC_MASK)
88 #define RTX_BINARY_MASK (~3)
89 #define RTX_BINARY_RESULT (RTX_COMPARE & RTX_BINARY_MASK)
90 #define RTX_COMMUTATIVE_MASK (~2)
91 #define RTX_COMMUTATIVE_RESULT (RTX_COMM_COMPARE & RTX_COMMUTATIVE_MASK)
92 #define RTX_NON_COMMUTATIVE_RESULT (RTX_COMPARE & RTX_COMMUTATIVE_MASK)
93
94 extern const unsigned char rtx_length[NUM_RTX_CODE];
95 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
96
97 extern const char * const rtx_name[NUM_RTX_CODE];
98 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
99
100 extern const char * const rtx_format[NUM_RTX_CODE];
101 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
102
103 extern const enum rtx_class rtx_class[NUM_RTX_CODE];
104 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
105
106 extern const unsigned char rtx_size[NUM_RTX_CODE];
107 extern const unsigned char rtx_next[NUM_RTX_CODE];
108 \f
109 /* The flags and bitfields of an ADDR_DIFF_VEC. BASE is the base label
110 relative to which the offsets are calculated, as explained in rtl.def. */
111 typedef struct
112 {
113 /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
114 unsigned min_align: 8;
115 /* Flags: */
116 unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC. */
117 unsigned min_after_vec: 1; /* minimum address target label is
118 after the ADDR_DIFF_VEC. */
119 unsigned max_after_vec: 1; /* maximum address target label is
120 after the ADDR_DIFF_VEC. */
121 unsigned min_after_base: 1; /* minimum address target label is
122 after BASE. */
123 unsigned max_after_base: 1; /* maximum address target label is
124 after BASE. */
125 /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
126 unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned. */
127 unsigned : 2;
128 unsigned scale : 8;
129 } addr_diff_vec_flags;
130
131 /* Structure used to describe the attributes of a MEM. These are hashed
132 so MEMs that the same attributes share a data structure. This means
133 they cannot be modified in place. If any element is nonzero, it means
134 the value of the corresponding attribute is unknown. */
135 /* ALIGN and SIZE are the alignment and size of the MEM itself,
136 while EXPR can describe a larger underlying object, which might have a
137 stricter alignment; OFFSET is the offset of the MEM within that object. */
138 typedef struct mem_attrs GTY(())
139 {
140 HOST_WIDE_INT alias; /* Memory alias set. */
141 tree expr; /* expr corresponding to MEM. */
142 rtx offset; /* Offset from start of DECL, as CONST_INT. */
143 rtx size; /* Size in bytes, as a CONST_INT. */
144 unsigned int align; /* Alignment of MEM in bits. */
145 } mem_attrs;
146
147 /* Structure used to describe the attributes of a REG in similar way as
148 mem_attrs does for MEM above. */
149
150 typedef struct reg_attrs GTY(())
151 {
152 tree decl; /* decl corresponding to REG. */
153 HOST_WIDE_INT offset; /* Offset from start of DECL. */
154 } reg_attrs;
155
156 /* Common union for an element of an rtx. */
157
158 union rtunion_def
159 {
160 int rt_int;
161 unsigned int rt_uint;
162 const char *rt_str;
163 rtx rt_rtx;
164 rtvec rt_rtvec;
165 enum machine_mode rt_type;
166 addr_diff_vec_flags rt_addr_diff_vec_flags;
167 struct cselib_val_struct *rt_cselib;
168 struct bitmap_head_def *rt_bit;
169 tree rt_tree;
170 struct basic_block_def *rt_bb;
171 mem_attrs *rt_mem;
172 reg_attrs *rt_reg;
173 };
174 typedef union rtunion_def rtunion;
175
176 /* RTL expression ("rtx"). */
177
178 struct rtx_def GTY((chain_next ("RTX_NEXT (&%h)"),
179 chain_prev ("RTX_PREV (&%h)")))
180 {
181 /* The kind of expression this is. */
182 ENUM_BITFIELD(rtx_code) code: 16;
183
184 /* The kind of value the expression has. */
185 ENUM_BITFIELD(machine_mode) mode : 8;
186
187 /* 1 in a MEM if we should keep the alias set for this mem unchanged
188 when we access a component.
189 1 in a CALL_INSN if it is a sibling call.
190 1 in a SET that is for a return.
191 In a CODE_LABEL, part of the two-bit alternate entry field. */
192 unsigned int jump : 1;
193 /* In a CODE_LABEL, part of the two-bit alternate entry field.
194 1 in a MEM if it cannot trap. */
195 unsigned int call : 1;
196 /* 1 in a REG, MEM, or CONCAT if the value is set at most once, anywhere.
197 1 in a SUBREG if it references an unsigned object whose mode has been
198 from a promoted to a wider mode.
199 1 in a SYMBOL_REF if it addresses something in the per-function
200 constants pool.
201 1 in a CALL_INSN, NOTE, or EXPR_LIST for a const or pure call.
202 1 in a JUMP_INSN, CALL_INSN, or INSN of an annulling branch. */
203 unsigned int unchanging : 1;
204 /* 1 in a MEM or ASM_OPERANDS expression if the memory reference is volatile.
205 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL, BARRIER, or NOTE
206 if it has been deleted.
207 1 in a REG expression if corresponds to a variable declared by the user,
208 0 for an internally generated temporary.
209 1 in a SUBREG with a negative value.
210 1 in a LABEL_REF or in a REG_LABEL note for a non-local label.
211 In a SYMBOL_REF, this flag is used for machine-specific purposes. */
212 unsigned int volatil : 1;
213 /* 1 in a MEM referring to a field of an aggregate.
214 0 if the MEM was a variable or the result of a * operator in C;
215 1 if it was the result of a . or -> operator (on a struct) in C.
216 1 in a REG if the register is used only in exit code a loop.
217 1 in a SUBREG expression if was generated from a variable with a
218 promoted mode.
219 1 in a CODE_LABEL if the label is used for nonlocal gotos
220 and must not be deleted even if its count is zero.
221 1 in an INSN, JUMP_INSN or CALL_INSN if this insn must be scheduled
222 together with the preceding insn. Valid only within sched.
223 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
224 from the target of a branch. Valid from reorg until end of compilation;
225 cleared before used. */
226 unsigned int in_struct : 1;
227 /* At the end of RTL generation, 1 if this rtx is used. This is used for
228 copying shared structure. See `unshare_all_rtl'.
229 In a REG, this is not needed for that purpose, and used instead
230 in `leaf_renumber_regs_insn'.
231 1 in a SYMBOL_REF, means that emit_library_call
232 has used it as the function. */
233 unsigned int used : 1;
234 /* 1 in an INSN or a SET if this rtx is related to the call frame,
235 either changing how we compute the frame address or saving and
236 restoring registers in the prologue and epilogue.
237 1 in a REG or MEM if it is a pointer.
238 1 in a SYMBOL_REF if it addresses something in the per-function
239 constant string pool. */
240 unsigned frame_related : 1;
241 /* 1 in a REG or PARALLEL that is the current function's return value.
242 1 in a MEM if it refers to a scalar.
243 1 in a SYMBOL_REF for a weak symbol. */
244 unsigned return_val : 1;
245
246 /* The first element of the operands of this rtx.
247 The number of operands and their types are controlled
248 by the `code' field, according to rtl.def. */
249 union u {
250 rtunion fld[1];
251 HOST_WIDE_INT hwint[1];
252 } GTY ((special ("rtx_def"), desc ("GET_CODE (&%0)"))) u;
253 };
254
255 /* The size in bytes of an rtx header (code, mode and flags). */
256 #define RTX_HDR_SIZE offsetof (struct rtx_def, u)
257
258 /* The size in bytes of an rtx with code CODE. */
259 #define RTX_SIZE(CODE) rtx_size[CODE]
260
261 #define NULL_RTX (rtx) 0
262
263 /* The "next" and "previous" RTX, relative to this one. */
264
265 #define RTX_NEXT(X) (rtx_next[GET_CODE (X)] == 0 ? NULL \
266 : *(rtx *)(((char *)X) + rtx_next[GET_CODE (X)]))
267
268 /* FIXME: the "NEXT_INSN (PREV_INSN (X)) == X" condition shouldn't be needed.
269 */
270 #define RTX_PREV(X) ((INSN_P (X) \
271 || NOTE_P (X) \
272 || BARRIER_P (X) \
273 || LABEL_P (X)) \
274 && PREV_INSN (X) != NULL \
275 && NEXT_INSN (PREV_INSN (X)) == X \
276 ? PREV_INSN (X) : NULL)
277
278 /* Define macros to access the `code' field of the rtx. */
279
280 #define GET_CODE(RTX) ((enum rtx_code) (RTX)->code)
281 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
282
283 #define GET_MODE(RTX) ((enum machine_mode) (RTX)->mode)
284 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
285
286 /* RTL vector. These appear inside RTX's when there is a need
287 for a variable number of things. The principle use is inside
288 PARALLEL expressions. */
289
290 struct rtvec_def GTY(()) {
291 int num_elem; /* number of elements */
292 rtx GTY ((length ("%h.num_elem"))) elem[1];
293 };
294
295 #define NULL_RTVEC (rtvec) 0
296
297 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
298 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
299
300 /* Predicate yielding nonzero iff X is an rtx for a register. */
301 #define REG_P(X) (GET_CODE (X) == REG)
302
303 /* Predicate yielding nonzero iff X is an rtx for a memory location. */
304 #define MEM_P(X) (GET_CODE (X) == MEM)
305
306 /* Predicate yielding nonzero iff X is a label insn. */
307 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
308
309 /* Predicate yielding nonzero iff X is a jump insn. */
310 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
311
312 /* Predicate yielding nonzero iff X is a call insn. */
313 #define CALL_P(X) (GET_CODE (X) == CALL_INSN)
314
315 /* Predicate yielding nonzero iff X is an insn that cannot jump. */
316 #define NONJUMP_INSN_P(X) (GET_CODE (X) == INSN)
317
318 /* Predicate yielding nonzero iff X is a real insn. */
319 #define INSN_P(X) \
320 (NONJUMP_INSN_P (X) || JUMP_P (X) || CALL_P (X))
321
322 /* Predicate yielding nonzero iff X is a note insn. */
323 #define NOTE_P(X) (GET_CODE (X) == NOTE)
324
325 /* Predicate yielding nonzero iff X is a barrier insn. */
326 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
327
328 /* Predicate yielding nonzero iff X is a data for a jump table. */
329 #define JUMP_TABLE_DATA_P(INSN) \
330 (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
331 GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
332
333 /* 1 if X is a unary operator. */
334
335 #define UNARY_P(X) \
336 (GET_RTX_CLASS (GET_CODE (X)) == RTX_UNARY)
337
338 /* 1 if X is a binary operator. */
339
340 #define BINARY_P(X) \
341 ((GET_RTX_CLASS (GET_CODE (X)) & RTX_BINARY_MASK) == RTX_BINARY_RESULT)
342
343 /* 1 if X is an arithmetic operator. */
344
345 #define ARITHMETIC_P(X) \
346 ((GET_RTX_CLASS (GET_CODE (X)) & RTX_ARITHMETIC_MASK) \
347 == RTX_ARITHMETIC_RESULT)
348
349 /* 1 if X is an arithmetic operator. */
350
351 #define COMMUTATIVE_ARITH_P(X) \
352 (GET_RTX_CLASS (GET_CODE (X)) == RTX_COMM_ARITH)
353
354 /* 1 if X is a commutative arithmetic operator or a comparison operator.
355 These two are sometimes selected together because it is possible to
356 swap the two operands. */
357
358 #define SWAPPABLE_OPERANDS_P(X) \
359 ((1 << GET_RTX_CLASS (GET_CODE (X))) \
360 & ((1 << RTX_COMM_ARITH) | (1 << RTX_COMM_COMPARE) \
361 | (1 << RTX_COMPARE)))
362
363 /* 1 if X is a non-commutative operator. */
364
365 #define NON_COMMUTATIVE_P(X) \
366 ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK) \
367 == RTX_NON_COMMUTATIVE_RESULT)
368
369 /* 1 if X is a commutative operator on integers. */
370
371 #define COMMUTATIVE_P(X) \
372 ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK) \
373 == RTX_COMMUTATIVE_RESULT)
374
375 /* 1 if X is a relational operator. */
376
377 #define COMPARISON_P(X) \
378 ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMPARE_MASK) == RTX_COMPARE_RESULT)
379
380 /* 1 if X is a constant value that is an integer. */
381
382 #define CONSTANT_P(X) \
383 (GET_RTX_CLASS (GET_CODE (X)) == RTX_CONST_OBJ)
384
385 /* 1 if X can be used to represent an object. */
386 #define OBJECT_P(X) \
387 ((GET_RTX_CLASS (GET_CODE (X)) & RTX_OBJ_MASK) == RTX_OBJ_RESULT)
388
389 /* General accessor macros for accessing the fields of an rtx. */
390
391 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
392 /* The bit with a star outside the statement expr and an & inside is
393 so that N can be evaluated only once. */
394 #define RTL_CHECK1(RTX, N, C1) __extension__ \
395 (*({ rtx const _rtx = (RTX); const int _n = (N); \
396 const enum rtx_code _code = GET_CODE (_rtx); \
397 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
398 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
399 __FUNCTION__); \
400 if (GET_RTX_FORMAT(_code)[_n] != C1) \
401 rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__, \
402 __FUNCTION__); \
403 &_rtx->u.fld[_n]; }))
404
405 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
406 (*({ rtx const _rtx = (RTX); const int _n = (N); \
407 const enum rtx_code _code = GET_CODE (_rtx); \
408 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
409 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
410 __FUNCTION__); \
411 if (GET_RTX_FORMAT(_code)[_n] != C1 \
412 && GET_RTX_FORMAT(_code)[_n] != C2) \
413 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
414 __FUNCTION__); \
415 &_rtx->u.fld[_n]; }))
416
417 #define RTL_CHECKC1(RTX, N, C) __extension__ \
418 (*({ rtx const _rtx = (RTX); const int _n = (N); \
419 if (GET_CODE (_rtx) != (C)) \
420 rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__, \
421 __FUNCTION__); \
422 &_rtx->u.fld[_n]; }))
423
424 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
425 (*({ rtx const _rtx = (RTX); const int _n = (N); \
426 const enum rtx_code _code = GET_CODE (_rtx); \
427 if (_code != (C1) && _code != (C2)) \
428 rtl_check_failed_code2 (_rtx, (C1), (C2), __FILE__, __LINE__, \
429 __FUNCTION__); \
430 &_rtx->u.fld[_n]; }))
431
432 #define RTVEC_ELT(RTVEC, I) __extension__ \
433 (*({ rtvec const _rtvec = (RTVEC); const int _i = (I); \
434 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
435 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
436 __FUNCTION__); \
437 &_rtvec->elem[_i]; }))
438
439 #define XWINT(RTX, N) __extension__ \
440 (*({ rtx const _rtx = (RTX); const int _n = (N); \
441 const enum rtx_code _code = GET_CODE (_rtx); \
442 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
443 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
444 __FUNCTION__); \
445 if (GET_RTX_FORMAT(_code)[_n] != 'w') \
446 rtl_check_failed_type1 (_rtx, _n, 'w', __FILE__, __LINE__, \
447 __FUNCTION__); \
448 &_rtx->u.hwint[_n]; }))
449
450 #define XCWINT(RTX, N, C) __extension__ \
451 (*({ rtx const _rtx = (RTX); \
452 if (GET_CODE (_rtx) != (C)) \
453 rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__, \
454 __FUNCTION__); \
455 &_rtx->u.hwint[N]; }))
456
457 extern void rtl_check_failed_bounds (rtx, int, const char *, int,
458 const char *)
459 ATTRIBUTE_NORETURN;
460 extern void rtl_check_failed_type1 (rtx, int, int, const char *, int,
461 const char *)
462 ATTRIBUTE_NORETURN;
463 extern void rtl_check_failed_type2 (rtx, int, int, int, const char *,
464 int, const char *)
465 ATTRIBUTE_NORETURN;
466 extern void rtl_check_failed_code1 (rtx, enum rtx_code, const char *,
467 int, const char *)
468 ATTRIBUTE_NORETURN;
469 extern void rtl_check_failed_code2 (rtx, enum rtx_code, enum rtx_code,
470 const char *, int, const char *)
471 ATTRIBUTE_NORETURN;
472 extern void rtvec_check_failed_bounds (rtvec, int, const char *, int,
473 const char *)
474 ATTRIBUTE_NORETURN;
475
476 #else /* not ENABLE_RTL_CHECKING */
477
478 #define RTL_CHECK1(RTX, N, C1) ((RTX)->u.fld[N])
479 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->u.fld[N])
480 #define RTL_CHECKC1(RTX, N, C) ((RTX)->u.fld[N])
481 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->u.fld[N])
482 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
483 #define XWINT(RTX, N) ((RTX)->u.hwint[N])
484 #define XCWINT(RTX, N, C) ((RTX)->u.hwint[N])
485
486 #endif
487
488 /* General accessor macros for accessing the flags of an rtx. */
489
490 /* Access an individual rtx flag, with no checking of any kind. */
491 #define RTX_FLAG(RTX, FLAG) ((RTX)->FLAG)
492
493 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION >= 2007)
494 #define RTL_FLAG_CHECK1(NAME, RTX, C1) __extension__ \
495 ({ rtx const _rtx = (RTX); \
496 if (GET_CODE(_rtx) != C1) \
497 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
498 __FUNCTION__); \
499 _rtx; })
500
501 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) __extension__ \
502 ({ rtx const _rtx = (RTX); \
503 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2) \
504 rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
505 __FUNCTION__); \
506 _rtx; })
507
508 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) __extension__ \
509 ({ rtx const _rtx = (RTX); \
510 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
511 && GET_CODE(_rtx) != C3) \
512 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
513 __FUNCTION__); \
514 _rtx; })
515
516 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) __extension__ \
517 ({ rtx const _rtx = (RTX); \
518 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
519 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4) \
520 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
521 __FUNCTION__); \
522 _rtx; })
523
524 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) __extension__ \
525 ({ rtx const _rtx = (RTX); \
526 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
527 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
528 && GET_CODE(_rtx) != C5) \
529 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
530 __FUNCTION__); \
531 _rtx; })
532
533 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) \
534 __extension__ \
535 ({ rtx const _rtx = (RTX); \
536 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
537 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
538 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6) \
539 rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
540 __FUNCTION__); \
541 _rtx; })
542
543 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) \
544 __extension__ \
545 ({ rtx const _rtx = (RTX); \
546 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
547 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
548 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6 \
549 && GET_CODE(_rtx) != C7) \
550 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
551 __FUNCTION__); \
552 _rtx; })
553
554 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) \
555 __extension__ \
556 ({ rtx const _rtx = (RTX); \
557 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
558 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
559 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6 \
560 && GET_CODE(_rtx) != C7 && GET_CODE(_rtx) != C8) \
561 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
562 __FUNCTION__); \
563 _rtx; })
564
565 extern void rtl_check_failed_flag (const char *, rtx, const char *,
566 int, const char *)
567 ATTRIBUTE_NORETURN
568 ;
569
570 #else /* not ENABLE_RTL_FLAG_CHECKING */
571
572 #define RTL_FLAG_CHECK1(NAME, RTX, C1) (RTX)
573 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) (RTX)
574 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) (RTX)
575 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) (RTX)
576 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) (RTX)
577 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) (RTX)
578 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) (RTX)
579 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) (RTX)
580 #endif
581
582 #define XINT(RTX, N) (RTL_CHECK2 (RTX, N, 'i', 'n').rt_int)
583 #define XSTR(RTX, N) (RTL_CHECK2 (RTX, N, 's', 'S').rt_str)
584 #define XEXP(RTX, N) (RTL_CHECK2 (RTX, N, 'e', 'u').rt_rtx)
585 #define XVEC(RTX, N) (RTL_CHECK2 (RTX, N, 'E', 'V').rt_rtvec)
586 #define XMODE(RTX, N) (RTL_CHECK1 (RTX, N, 'M').rt_type)
587 #define XBITMAP(RTX, N) (RTL_CHECK1 (RTX, N, 'b').rt_bit)
588 #define XTREE(RTX, N) (RTL_CHECK1 (RTX, N, 't').rt_tree)
589 #define XBBDEF(RTX, N) (RTL_CHECK1 (RTX, N, 'B').rt_bb)
590 #define XTMPL(RTX, N) (RTL_CHECK1 (RTX, N, 'T').rt_str)
591
592 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
593 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
594
595 /* These are like XINT, etc. except that they expect a '0' field instead
596 of the normal type code. */
597
598 #define X0INT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_int)
599 #define X0UINT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_uint)
600 #define X0STR(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_str)
601 #define X0EXP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_rtx)
602 #define X0VEC(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_rtvec)
603 #define X0MODE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_type)
604 #define X0BITMAP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_bit)
605 #define X0TREE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_tree)
606 #define X0BBDEF(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_bb)
607 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_addr_diff_vec_flags)
608 #define X0CSELIB(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_cselib)
609 #define X0MEMATTR(RTX, N) (RTL_CHECKC1 (RTX, N, MEM).rt_mem)
610 #define X0REGATTR(RTX, N) (RTL_CHECKC1 (RTX, N, REG).rt_reg)
611
612 /* Access a '0' field with any type. */
613 #define X0ANY(RTX, N) RTL_CHECK1 (RTX, N, '0')
614
615 #define XCINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_int)
616 #define XCUINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_uint)
617 #define XCSTR(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_str)
618 #define XCEXP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_rtx)
619 #define XCVEC(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_rtvec)
620 #define XCMODE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_type)
621 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_bit)
622 #define XCTREE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_tree)
623 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_bb)
624 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_cselib)
625
626 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
627 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
628
629 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2 (RTX, N, C1, C2).rt_rtx)
630 \f
631 /* ACCESS MACROS for particular fields of insns. */
632
633 /* Holds a unique number for each insn.
634 These are not necessarily sequentially increasing. */
635 #define INSN_UID(INSN) XINT (INSN, 0)
636
637 /* Chain insns together in sequence. */
638 #define PREV_INSN(INSN) XEXP (INSN, 1)
639 #define NEXT_INSN(INSN) XEXP (INSN, 2)
640
641 #define BLOCK_FOR_INSN(INSN) XBBDEF (INSN, 3)
642 #define INSN_LOCATOR(INSN) XINT (INSN, 4)
643 /* The body of an insn. */
644 #define PATTERN(INSN) XEXP (INSN, 5)
645
646 /* Code number of instruction, from when it was recognized.
647 -1 means this instruction has not been recognized yet. */
648 #define INSN_CODE(INSN) XINT (INSN, 6)
649
650 /* Set up in flow.c; empty before then.
651 Holds a chain of INSN_LIST rtx's whose first operands point at
652 previous insns with direct data-flow connections to this one.
653 That means that those insns set variables whose next use is in this insn.
654 They are always in the same basic block as this insn. */
655 #define LOG_LINKS(INSN) XEXP(INSN, 7)
656
657 #define RTX_FRAME_RELATED_P(RTX) \
658 (RTL_FLAG_CHECK5("RTX_FRAME_RELATED_P", (RTX), INSN, CALL_INSN, \
659 JUMP_INSN, BARRIER, SET)->frame_related)
660
661 /* 1 if RTX is an insn that has been deleted. */
662 #define INSN_DELETED_P(RTX) \
663 (RTL_FLAG_CHECK6("INSN_DELETED_P", (RTX), INSN, CALL_INSN, JUMP_INSN, \
664 CODE_LABEL, BARRIER, NOTE)->volatil)
665
666 /* 1 if RTX is a call to a const or pure function. */
667 #define CONST_OR_PURE_CALL_P(RTX) \
668 (RTL_FLAG_CHECK3("CONST_OR_PURE_CALL_P", (RTX), CALL_INSN, NOTE, \
669 EXPR_LIST)->unchanging)
670
671 /* 1 if RTX is a call_insn for a sibling call. */
672 #define SIBLING_CALL_P(RTX) \
673 (RTL_FLAG_CHECK1("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
674
675 /* 1 if RTX is a jump_insn, call_insn, or insn that is an annulling branch. */
676 #define INSN_ANNULLED_BRANCH_P(RTX) \
677 (RTL_FLAG_CHECK3("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN, CALL_INSN, INSN)->unchanging)
678
679 /* 1 if RTX is an insn in a delay slot and is from the target of the branch.
680 If the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
681 executed if the branch is taken. For annulled branches with this bit
682 clear, the insn should be executed only if the branch is not taken. */
683 #define INSN_FROM_TARGET_P(RTX) \
684 (RTL_FLAG_CHECK3("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, CALL_INSN)->in_struct)
685
686 /* In an ADDR_DIFF_VEC, the flags for RTX for use by branch shortening.
687 See the comments for ADDR_DIFF_VEC in rtl.def. */
688 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
689
690 /* In a VALUE, the value cselib has assigned to RTX.
691 This is a "struct cselib_val_struct", see cselib.h. */
692 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
693
694 /* Holds a list of notes on what this insn does to various REGs.
695 It is a chain of EXPR_LIST rtx's, where the second operand is the
696 chain pointer and the first operand is the REG being described.
697 The mode field of the EXPR_LIST contains not a real machine mode
698 but a value from enum reg_note. */
699 #define REG_NOTES(INSN) XEXP(INSN, 8)
700
701 enum reg_note
702 {
703 #define DEF_REG_NOTE(NAME) NAME,
704 #include "reg-notes.def"
705 #undef DEF_REG_NOTE
706 REG_NOTE_MAX
707 };
708
709 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
710 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
711 #define PUT_REG_NOTE_KIND(LINK, KIND) \
712 PUT_MODE (LINK, (enum machine_mode) (KIND))
713
714 /* Names for REG_NOTE's in EXPR_LIST insn's. */
715
716 extern const char * const reg_note_name[];
717 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
718
719 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
720 USE and CLOBBER expressions.
721 USE expressions list the registers filled with arguments that
722 are passed to the function.
723 CLOBBER expressions document the registers explicitly clobbered
724 by this CALL_INSN.
725 Pseudo registers can not be mentioned in this list. */
726 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 9)
727
728 /* The label-number of a code-label. The assembler label
729 is made from `L' and the label-number printed in decimal.
730 Label numbers are unique in a compilation. */
731 #define CODE_LABEL_NUMBER(INSN) XINT (INSN, 6)
732
733 /* In a NOTE that is a line number, this is a string for the file name that the
734 line is in. We use the same field to record block numbers temporarily in
735 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
736 between ints and pointers if we use a different macro for the block number.)
737 */
738
739 /* Opaque data. */
740 #define NOTE_DATA(INSN) RTL_CHECKC1 (INSN, 4, NOTE)
741 #define NOTE_DELETED_LABEL_NAME(INSN) XCSTR (INSN, 4, NOTE)
742 #ifdef USE_MAPPED_LOCATION
743 #define NOTE_SOURCE_LOCATION(INSN) XCUINT (INSN, 5, NOTE)
744 #define NOTE_EXPANDED_LOCATION(XLOC, INSN) \
745 (XLOC) = expand_location (NOTE_SOURCE_LOCATION (INSN))
746 #define SET_INSN_DELETED(INSN) \
747 (PUT_CODE (INSN, NOTE), NOTE_LINE_NUMBER (INSN) = NOTE_INSN_DELETED)
748 #else
749 #define NOTE_EXPANDED_LOCATION(XLOC, INSN) \
750 ((XLOC).file = NOTE_SOURCE_FILE (INSN), \
751 (XLOC).line = NOTE_LINE_NUMBER (INSN))
752 #define NOTE_SOURCE_FILE(INSN) XCSTR (INSN, 4, NOTE)
753 #define SET_INSN_DELETED(INSN) \
754 (PUT_CODE (INSN, NOTE), NOTE_SOURCE_FILE (INSN) = 0, \
755 NOTE_LINE_NUMBER (INSN) = NOTE_INSN_DELETED)
756 #endif
757 #define NOTE_BLOCK(INSN) XCTREE (INSN, 4, NOTE)
758 #define NOTE_EH_HANDLER(INSN) XCINT (INSN, 4, NOTE)
759 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF (INSN, 4, NOTE)
760 #define NOTE_EXPECTED_VALUE(INSN) XCEXP (INSN, 4, NOTE)
761 #define NOTE_VAR_LOCATION(INSN) XCEXP (INSN, 4, NOTE)
762
763 /* In a NOTE that is a line number, this is the line number.
764 Other kinds of NOTEs are identified by negative numbers here. */
765 #define NOTE_LINE_NUMBER(INSN) XCINT (INSN, 5, NOTE)
766
767 /* Nonzero if INSN is a note marking the beginning of a basic block. */
768 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
769 (GET_CODE (INSN) == NOTE \
770 && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
771
772 /* Variable declaration and the location of a variable. */
773 #define NOTE_VAR_LOCATION_DECL(INSN) (XCTREE (XCEXP (INSN, 4, NOTE), \
774 0, VAR_LOCATION))
775 #define NOTE_VAR_LOCATION_LOC(INSN) (XCEXP (XCEXP (INSN, 4, NOTE), \
776 1, VAR_LOCATION))
777
778 /* Codes that appear in the NOTE_LINE_NUMBER field for kinds of notes
779 that are not line numbers. These codes are all negative.
780
781 Notice that we do not try to use zero here for any of
782 the special note codes because sometimes the source line
783 actually can be zero! This happens (for example) when we
784 are generating code for the per-translation-unit constructor
785 and destructor routines for some C++ translation unit. */
786
787 enum insn_note
788 {
789 /* Keep all of these numbers negative. Adjust as needed. */
790 NOTE_INSN_BIAS = -100,
791
792 #define DEF_INSN_NOTE(NAME) NAME,
793 #include "insn-notes.def"
794 #undef DEF_INSN_NOTE
795
796 NOTE_INSN_MAX
797 };
798
799 /* Names for NOTE insn's other than line numbers. */
800
801 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
802 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
803 (note_insn_name[(NOTE_CODE) - (int) NOTE_INSN_BIAS])
804
805 /* The name of a label, in case it corresponds to an explicit label
806 in the input source code. */
807 #define LABEL_NAME(RTX) XCSTR (RTX, 7, CODE_LABEL)
808
809 /* In jump.c, each label contains a count of the number
810 of LABEL_REFs that point at it, so unused labels can be deleted. */
811 #define LABEL_NUSES(RTX) XCINT (RTX, 4, CODE_LABEL)
812
813 /* Labels carry a two-bit field composed of the ->jump and ->call
814 bits. This field indicates whether the label is an alternate
815 entry point, and if so, what kind. */
816 enum label_kind
817 {
818 LABEL_NORMAL = 0, /* ordinary label */
819 LABEL_STATIC_ENTRY, /* alternate entry point, not exported */
820 LABEL_GLOBAL_ENTRY, /* alternate entry point, exported */
821 LABEL_WEAK_ENTRY /* alternate entry point, exported as weak symbol */
822 };
823
824 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION > 2007)
825
826 /* Retrieve the kind of LABEL. */
827 #define LABEL_KIND(LABEL) __extension__ \
828 ({ rtx const _label = (LABEL); \
829 if (GET_CODE (_label) != CODE_LABEL) \
830 rtl_check_failed_flag ("LABEL_KIND", _label, __FILE__, __LINE__, \
831 __FUNCTION__); \
832 (enum label_kind) ((_label->jump << 1) | _label->call); })
833
834 /* Set the kind of LABEL. */
835 #define SET_LABEL_KIND(LABEL, KIND) do { \
836 rtx _label = (LABEL); \
837 unsigned int _kind = (KIND); \
838 if (GET_CODE (_label) != CODE_LABEL) \
839 rtl_check_failed_flag ("SET_LABEL_KIND", _label, __FILE__, __LINE__, \
840 __FUNCTION__); \
841 _label->jump = ((_kind >> 1) & 1); \
842 _label->call = (_kind & 1); \
843 } while (0)
844
845 #else
846
847 /* Retrieve the kind of LABEL. */
848 #define LABEL_KIND(LABEL) \
849 ((enum label_kind) (((LABEL)->jump << 1) | (LABEL)->call))
850
851 /* Set the kind of LABEL. */
852 #define SET_LABEL_KIND(LABEL, KIND) do { \
853 rtx _label = (LABEL); \
854 unsigned int _kind = (KIND); \
855 _label->jump = ((_kind >> 1) & 1); \
856 _label->call = (_kind & 1); \
857 } while (0)
858
859 #endif /* rtl flag checking */
860
861 #define LABEL_ALT_ENTRY_P(LABEL) (LABEL_KIND (LABEL) != LABEL_NORMAL)
862
863 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
864 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
865 be decremented and possibly the label can be deleted. */
866 #define JUMP_LABEL(INSN) XCEXP (INSN, 9, JUMP_INSN)
867
868 /* Once basic blocks are found in flow.c,
869 each CODE_LABEL starts a chain that goes through
870 all the LABEL_REFs that jump to that label.
871 The chain eventually winds up at the CODE_LABEL: it is circular. */
872 #define LABEL_REFS(LABEL) XCEXP (LABEL, 5, CODE_LABEL)
873 \f
874 /* This is the field in the LABEL_REF through which the circular chain
875 of references to a particular label is linked.
876 FIXME: This chain is used in loop.c and in the SH backend.
877 Since loop.c is about to go away, it could be a win to replace
878 the uses of this in the SH backend with something else. */
879 #define LABEL_NEXTREF(REF) XCEXP (REF, 1, LABEL_REF)
880
881 /* For a REG rtx, REGNO extracts the register number. ORIGINAL_REGNO holds
882 the number the register originally had; for a pseudo register turned into
883 a hard reg this will hold the old pseudo register number. */
884
885 #define REGNO(RTX) XCUINT (RTX, 0, REG)
886 #define ORIGINAL_REGNO(RTX) X0UINT (RTX, 1)
887
888 /* 1 if RTX is a reg or parallel that is the current function's return
889 value. */
890 #define REG_FUNCTION_VALUE_P(RTX) \
891 (RTL_FLAG_CHECK2("REG_FUNCTION_VALUE_P", (RTX), REG, PARALLEL)->return_val)
892
893 /* 1 if RTX is a reg that corresponds to a variable declared by the user. */
894 #define REG_USERVAR_P(RTX) \
895 (RTL_FLAG_CHECK1("REG_USERVAR_P", (RTX), REG)->volatil)
896
897 /* 1 if RTX is a reg that holds a pointer value. */
898 #define REG_POINTER(RTX) \
899 (RTL_FLAG_CHECK1("REG_POINTER", (RTX), REG)->frame_related)
900
901 /* 1 if RTX is a mem that holds a pointer value. */
902 #define MEM_POINTER(RTX) \
903 (RTL_FLAG_CHECK1("MEM_POINTER", (RTX), MEM)->frame_related)
904
905 /* 1 if the given register REG corresponds to a hard register. */
906 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
907
908 /* 1 if the given register number REG_NO corresponds to a hard register. */
909 #define HARD_REGISTER_NUM_P(REG_NO) ((REG_NO) < FIRST_PSEUDO_REGISTER)
910
911 /* For a CONST_INT rtx, INTVAL extracts the integer. */
912 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
913
914 /* For a CONST_DOUBLE:
915 For a VOIDmode, there are two integers CONST_DOUBLE_LOW is the
916 low-order word and ..._HIGH the high-order.
917 For a float, there is a REAL_VALUE_TYPE structure, and
918 CONST_DOUBLE_REAL_VALUE(r) is a pointer to it. */
919 #define CONST_DOUBLE_LOW(r) XCWINT (r, 0, CONST_DOUBLE)
920 #define CONST_DOUBLE_HIGH(r) XCWINT (r, 1, CONST_DOUBLE)
921 #define CONST_DOUBLE_REAL_VALUE(r) ((struct real_value *)&CONST_DOUBLE_LOW(r))
922
923 /* For a CONST_VECTOR, return element #n. */
924 #define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR)
925
926 /* For a CONST_VECTOR, return the number of elements in a vector. */
927 #define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR)
928
929 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
930 SUBREG_BYTE extracts the byte-number. */
931
932 #define SUBREG_REG(RTX) XCEXP (RTX, 0, SUBREG)
933 #define SUBREG_BYTE(RTX) XCUINT (RTX, 1, SUBREG)
934
935 /* in rtlanal.c */
936 /* Return the right cost to give to an operation
937 to make the cost of the corresponding register-to-register instruction
938 N times that of a fast register-to-register instruction. */
939 #define COSTS_N_INSNS(N) ((N) * 4)
940
941 /* Maximum cost of an rtl expression. This value has the special meaning
942 not to use an rtx with this cost under any circumstances. */
943 #define MAX_COST INT_MAX
944
945 extern void init_rtlanal (void);
946 extern int rtx_cost (rtx, enum rtx_code);
947 extern int address_cost (rtx, enum machine_mode);
948 extern unsigned int subreg_lsb (rtx);
949 extern unsigned int subreg_lsb_1 (enum machine_mode, enum machine_mode,
950 unsigned int);
951 extern unsigned int subreg_regno_offset (unsigned int, enum machine_mode,
952 unsigned int, enum machine_mode);
953 extern bool subreg_offset_representable_p (unsigned int, enum machine_mode,
954 unsigned int, enum machine_mode);
955 extern unsigned int subreg_regno (rtx);
956 extern unsigned HOST_WIDE_INT nonzero_bits (rtx, enum machine_mode);
957 extern unsigned int num_sign_bit_copies (rtx, enum machine_mode);
958
959
960 /* 1 if RTX is a subreg containing a reg that is already known to be
961 sign- or zero-extended from the mode of the subreg to the mode of
962 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
963 extension.
964
965 When used as a LHS, is means that this extension must be done
966 when assigning to SUBREG_REG. */
967
968 #define SUBREG_PROMOTED_VAR_P(RTX) \
969 (RTL_FLAG_CHECK1("SUBREG_PROMOTED", (RTX), SUBREG)->in_struct)
970
971 #define SUBREG_PROMOTED_UNSIGNED_SET(RTX, VAL) \
972 do { \
973 rtx const _rtx = RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_SET", (RTX), SUBREG); \
974 if ((VAL) < 0) \
975 _rtx->volatil = 1; \
976 else { \
977 _rtx->volatil = 0; \
978 _rtx->unchanging = (VAL); \
979 } \
980 } while (0)
981 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) \
982 ((RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
983 ? -1 : (RTX)->unchanging)
984
985 /* Access various components of an ASM_OPERANDS rtx. */
986
987 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR (RTX, 0, ASM_OPERANDS)
988 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR (RTX, 1, ASM_OPERANDS)
989 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT (RTX, 2, ASM_OPERANDS)
990 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC (RTX, 3, ASM_OPERANDS)
991 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC (RTX, 4, ASM_OPERANDS)
992 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP (RTX, 3, N, ASM_OPERANDS)
993 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN (RTX, 3, ASM_OPERANDS)
994 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
995 XCVECEXP (RTX, 4, N, ASM_OPERANDS)
996 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
997 XSTR (XCVECEXP (RTX, 4, N, ASM_OPERANDS), 0)
998 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
999 GET_MODE (XCVECEXP (RTX, 4, N, ASM_OPERANDS))
1000 #ifdef USE_MAPPED_LOCATION
1001 #define ASM_OPERANDS_SOURCE_LOCATION(RTX) XCUINT (RTX, 5, ASM_OPERANDS)
1002 #else
1003 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR (RTX, 5, ASM_OPERANDS)
1004 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT (RTX, 6, ASM_OPERANDS)
1005 #endif
1006
1007 /* 1 if RTX is a mem that is statically allocated in read-only memory. */
1008 #define MEM_READONLY_P(RTX) \
1009 (RTL_FLAG_CHECK1("MEM_READONLY_P", (RTX), MEM)->unchanging)
1010
1011 /* 1 if RTX is a mem and we should keep the alias set for this mem
1012 unchanged when we access a component. Set to 1, or example, when we
1013 are already in a non-addressable component of an aggregate. */
1014 #define MEM_KEEP_ALIAS_SET_P(RTX) \
1015 (RTL_FLAG_CHECK1("MEM_KEEP_ALIAS_SET_P", (RTX), MEM)->jump)
1016
1017 /* 1 if RTX is a mem or asm_operand for a volatile reference. */
1018 #define MEM_VOLATILE_P(RTX) \
1019 (RTL_FLAG_CHECK3("MEM_VOLATILE_P", (RTX), MEM, ASM_OPERANDS, \
1020 ASM_INPUT)->volatil)
1021
1022 /* 1 if RTX is a mem that refers to an aggregate, either to the
1023 aggregate itself of to a field of the aggregate. If zero, RTX may
1024 or may not be such a reference. */
1025 #define MEM_IN_STRUCT_P(RTX) \
1026 (RTL_FLAG_CHECK1("MEM_IN_STRUCT_P", (RTX), MEM)->in_struct)
1027
1028 /* 1 if RTX is a MEM that refers to a scalar. If zero, RTX may or may
1029 not refer to a scalar. */
1030 #define MEM_SCALAR_P(RTX) \
1031 (RTL_FLAG_CHECK1("MEM_SCALAR_P", (RTX), MEM)->return_val)
1032
1033 /* 1 if RTX is a mem that cannot trap. */
1034 #define MEM_NOTRAP_P(RTX) \
1035 (RTL_FLAG_CHECK1("MEM_NOTRAP_P", (RTX), MEM)->call)
1036
1037 /* If VAL is nonzero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
1038 RTX. Otherwise, vice versa. Use this macro only when you are
1039 *sure* that you know that the MEM is in a structure, or is a
1040 scalar. VAL is evaluated only once. */
1041 #define MEM_SET_IN_STRUCT_P(RTX, VAL) \
1042 do { \
1043 if (VAL) \
1044 { \
1045 MEM_IN_STRUCT_P (RTX) = 1; \
1046 MEM_SCALAR_P (RTX) = 0; \
1047 } \
1048 else \
1049 { \
1050 MEM_IN_STRUCT_P (RTX) = 0; \
1051 MEM_SCALAR_P (RTX) = 1; \
1052 } \
1053 } while (0)
1054
1055 /* The memory attribute block. We provide access macros for each value
1056 in the block and provide defaults if none specified. */
1057 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
1058
1059 /* The register attribute block. We provide access macros for each value
1060 in the block and provide defaults if none specified. */
1061 #define REG_ATTRS(RTX) X0REGATTR (RTX, 2)
1062
1063 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
1064 set, and may alias anything. Otherwise, the MEM can only alias
1065 MEMs in a conflicting alias set. This value is set in a
1066 language-dependent manner in the front-end, and should not be
1067 altered in the back-end. These set numbers are tested with
1068 alias_sets_conflict_p. */
1069 #define MEM_ALIAS_SET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->alias)
1070
1071 /* For a MEM rtx, the decl it is known to refer to, if it is known to
1072 refer to part of a DECL. It may also be a COMPONENT_REF. */
1073 #define MEM_EXPR(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->expr)
1074
1075 /* For a MEM rtx, the offset from the start of MEM_EXPR, if known, as a
1076 RTX that is always a CONST_INT. */
1077 #define MEM_OFFSET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->offset)
1078
1079 /* For a MEM rtx, the size in bytes of the MEM, if known, as an RTX that
1080 is always a CONST_INT. */
1081 #define MEM_SIZE(RTX) \
1082 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->size \
1083 : GET_MODE (RTX) != BLKmode ? GEN_INT (GET_MODE_SIZE (GET_MODE (RTX))) \
1084 : 0)
1085
1086 /* For a MEM rtx, the alignment in bits. We can use the alignment of the
1087 mode as a default when STRICT_ALIGNMENT, but not if not. */
1088 #define MEM_ALIGN(RTX) \
1089 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->align \
1090 : (STRICT_ALIGNMENT && GET_MODE (RTX) != BLKmode \
1091 ? GET_MODE_ALIGNMENT (GET_MODE (RTX)) : BITS_PER_UNIT))
1092
1093 /* For a REG rtx, the decl it is known to refer to, if it is known to
1094 refer to part of a DECL. */
1095 #define REG_EXPR(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->decl)
1096
1097 /* For a MEM rtx, the offset from the start of MEM_DECL, if known, as a
1098 RTX that is always a CONST_INT. */
1099 #define REG_OFFSET(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->offset)
1100
1101 /* Copy the attributes that apply to memory locations from RHS to LHS. */
1102 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
1103 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
1104 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
1105 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
1106 MEM_NOTRAP_P (LHS) = MEM_NOTRAP_P (RHS), \
1107 MEM_READONLY_P (LHS) = MEM_READONLY_P (RHS), \
1108 MEM_KEEP_ALIAS_SET_P (LHS) = MEM_KEEP_ALIAS_SET_P (RHS), \
1109 MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
1110
1111 /* 1 if RTX is a label_ref to a label outside the loop containing the
1112 reference. */
1113 #define LABEL_OUTSIDE_LOOP_P(RTX) \
1114 (RTL_FLAG_CHECK1("LABEL_OUTSIDE_LOOP_P", (RTX), LABEL_REF)->in_struct)
1115
1116 /* 1 if RTX is a label_ref for a nonlocal label. */
1117 /* Likewise in an expr_list for a reg_label note. */
1118 #define LABEL_REF_NONLOCAL_P(RTX) \
1119 (RTL_FLAG_CHECK2("LABEL_REF_NONLOCAL_P", (RTX), LABEL_REF, \
1120 REG_LABEL)->volatil)
1121
1122 /* 1 if RTX is a code_label that should always be considered to be needed. */
1123 #define LABEL_PRESERVE_P(RTX) \
1124 (RTL_FLAG_CHECK2("LABEL_PRESERVE_P", (RTX), CODE_LABEL, NOTE)->in_struct)
1125
1126 /* During sched, 1 if RTX is an insn that must be scheduled together
1127 with the preceding insn. */
1128 #define SCHED_GROUP_P(RTX) \
1129 (RTL_FLAG_CHECK3("SCHED_GROUP_P", (RTX), INSN, JUMP_INSN, CALL_INSN \
1130 )->in_struct)
1131
1132 /* For a SET rtx, SET_DEST is the place that is set
1133 and SET_SRC is the value it is set to. */
1134 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
1135 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
1136 #define SET_IS_RETURN_P(RTX) \
1137 (RTL_FLAG_CHECK1("SET_IS_RETURN_P", (RTX), SET)->jump)
1138
1139 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
1140 #define TRAP_CONDITION(RTX) XCEXP (RTX, 0, TRAP_IF)
1141 #define TRAP_CODE(RTX) XCEXP (RTX, 1, TRAP_IF)
1142
1143 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
1144 conditionally executing the code on, COND_EXEC_CODE is the code
1145 to execute if the condition is true. */
1146 #define COND_EXEC_TEST(RTX) XCEXP (RTX, 0, COND_EXEC)
1147 #define COND_EXEC_CODE(RTX) XCEXP (RTX, 1, COND_EXEC)
1148
1149 /* 1 if RTX is a symbol_ref that addresses this function's rtl
1150 constants pool. */
1151 #define CONSTANT_POOL_ADDRESS_P(RTX) \
1152 (RTL_FLAG_CHECK1("CONSTANT_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->unchanging)
1153
1154 /* 1 if RTX is a symbol_ref that addresses a value in the file's
1155 tree constant pool. This information is private to varasm.c. */
1156 #define TREE_CONSTANT_POOL_ADDRESS_P(RTX) \
1157 (RTL_FLAG_CHECK1("TREE_CONSTANT_POOL_ADDRESS_P", \
1158 (RTX), SYMBOL_REF)->frame_related)
1159
1160 /* Used if RTX is a symbol_ref, for machine-specific purposes. */
1161 #define SYMBOL_REF_FLAG(RTX) \
1162 (RTL_FLAG_CHECK1("SYMBOL_REF_FLAG", (RTX), SYMBOL_REF)->volatil)
1163
1164 /* 1 if RTX is a symbol_ref that has been the library function in
1165 emit_library_call. */
1166 #define SYMBOL_REF_USED(RTX) \
1167 (RTL_FLAG_CHECK1("SYMBOL_REF_USED", (RTX), SYMBOL_REF)->used)
1168
1169 /* 1 if RTX is a symbol_ref for a weak symbol. */
1170 #define SYMBOL_REF_WEAK(RTX) \
1171 (RTL_FLAG_CHECK1("SYMBOL_REF_WEAK", (RTX), SYMBOL_REF)->return_val)
1172
1173 /* The tree (decl or constant) associated with the symbol, or null. */
1174 #define SYMBOL_REF_DECL(RTX) X0TREE ((RTX), 2)
1175
1176 /* A set of flags on a symbol_ref that are, in some respects, redundant with
1177 information derivable from the tree decl associated with this symbol.
1178 Except that we build a *lot* of SYMBOL_REFs that aren't associated with a
1179 decl. In some cases this is a bug. But beyond that, it's nice to cache
1180 this information to avoid recomputing it. Finally, this allows space for
1181 the target to store more than one bit of information, as with
1182 SYMBOL_REF_FLAG. */
1183 #define SYMBOL_REF_FLAGS(RTX) X0INT ((RTX), 1)
1184
1185 /* These flags are common enough to be defined for all targets. They
1186 are computed by the default version of targetm.encode_section_info. */
1187
1188 /* Set if this symbol is a function. */
1189 #define SYMBOL_FLAG_FUNCTION (1 << 0)
1190 #define SYMBOL_REF_FUNCTION_P(RTX) \
1191 ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_FUNCTION) != 0)
1192 /* Set if targetm.binds_local_p is true. */
1193 #define SYMBOL_FLAG_LOCAL (1 << 1)
1194 #define SYMBOL_REF_LOCAL_P(RTX) \
1195 ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_LOCAL) != 0)
1196 /* Set if targetm.in_small_data_p is true. */
1197 #define SYMBOL_FLAG_SMALL (1 << 2)
1198 #define SYMBOL_REF_SMALL_P(RTX) \
1199 ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_SMALL) != 0)
1200 /* The three-bit field at [5:3] is true for TLS variables; use
1201 SYMBOL_REF_TLS_MODEL to extract the field as an enum tls_model. */
1202 #define SYMBOL_FLAG_TLS_SHIFT 3
1203 #define SYMBOL_REF_TLS_MODEL(RTX) \
1204 ((enum tls_model) ((SYMBOL_REF_FLAGS (RTX) >> SYMBOL_FLAG_TLS_SHIFT) & 7))
1205 /* Set if this symbol is not defined in this translation unit. */
1206 #define SYMBOL_FLAG_EXTERNAL (1 << 6)
1207 #define SYMBOL_REF_EXTERNAL_P(RTX) \
1208 ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_EXTERNAL) != 0)
1209
1210 /* Subsequent bits are available for the target to use. */
1211 #define SYMBOL_FLAG_MACH_DEP_SHIFT 7
1212 #define SYMBOL_FLAG_MACH_DEP (1 << SYMBOL_FLAG_MACH_DEP_SHIFT)
1213
1214 /* Define a macro to look for REG_INC notes,
1215 but save time on machines where they never exist. */
1216
1217 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
1218 #define FIND_REG_INC_NOTE(INSN, REG) \
1219 ((REG) != NULL_RTX && REG_P ((REG)) \
1220 ? find_regno_note ((INSN), REG_INC, REGNO (REG)) \
1221 : find_reg_note ((INSN), REG_INC, (REG)))
1222 #else
1223 #define FIND_REG_INC_NOTE(INSN, REG) 0
1224 #endif
1225
1226 /* Indicate whether the machine has any sort of auto increment addressing.
1227 If not, we can avoid checking for REG_INC notes. */
1228
1229 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
1230 #define AUTO_INC_DEC
1231 #endif
1232
1233 #ifndef HAVE_PRE_INCREMENT
1234 #define HAVE_PRE_INCREMENT 0
1235 #endif
1236
1237 #ifndef HAVE_PRE_DECREMENT
1238 #define HAVE_PRE_DECREMENT 0
1239 #endif
1240
1241 #ifndef HAVE_POST_INCREMENT
1242 #define HAVE_POST_INCREMENT 0
1243 #endif
1244
1245 #ifndef HAVE_POST_DECREMENT
1246 #define HAVE_POST_DECREMENT 0
1247 #endif
1248
1249 #ifndef HAVE_POST_MODIFY_DISP
1250 #define HAVE_POST_MODIFY_DISP 0
1251 #endif
1252
1253 #ifndef HAVE_POST_MODIFY_REG
1254 #define HAVE_POST_MODIFY_REG 0
1255 #endif
1256
1257 #ifndef HAVE_PRE_MODIFY_DISP
1258 #define HAVE_PRE_MODIFY_DISP 0
1259 #endif
1260
1261 #ifndef HAVE_PRE_MODIFY_REG
1262 #define HAVE_PRE_MODIFY_REG 0
1263 #endif
1264
1265
1266 /* Some architectures do not have complete pre/post increment/decrement
1267 instruction sets, or only move some modes efficiently. These macros
1268 allow us to tune autoincrement generation. */
1269
1270 #ifndef USE_LOAD_POST_INCREMENT
1271 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1272 #endif
1273
1274 #ifndef USE_LOAD_POST_DECREMENT
1275 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1276 #endif
1277
1278 #ifndef USE_LOAD_PRE_INCREMENT
1279 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1280 #endif
1281
1282 #ifndef USE_LOAD_PRE_DECREMENT
1283 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1284 #endif
1285
1286 #ifndef USE_STORE_POST_INCREMENT
1287 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1288 #endif
1289
1290 #ifndef USE_STORE_POST_DECREMENT
1291 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1292 #endif
1293
1294 #ifndef USE_STORE_PRE_INCREMENT
1295 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1296 #endif
1297
1298 #ifndef USE_STORE_PRE_DECREMENT
1299 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1300 #endif
1301 \f
1302 /* Nonzero when we are generating CONCATs. */
1303 extern int generating_concat_p;
1304
1305 /* Nonzero when we are expanding trees to RTL. */
1306 extern int currently_expanding_to_rtl;
1307
1308 /* Generally useful functions. */
1309
1310 /* In expmed.c */
1311 extern int ceil_log2 (unsigned HOST_WIDE_INT);
1312
1313 /* In builtins.c */
1314 extern rtx expand_builtin_expect_jump (tree, rtx, rtx);
1315
1316 /* In explow.c */
1317 extern void set_stack_check_libfunc (rtx);
1318 extern HOST_WIDE_INT trunc_int_for_mode (HOST_WIDE_INT, enum machine_mode);
1319 extern rtx plus_constant (rtx, HOST_WIDE_INT);
1320
1321 /* In emit-rtl.c */
1322 extern rtvec gen_rtvec (int, ...);
1323 extern rtx copy_insn_1 (rtx);
1324 extern rtx copy_insn (rtx);
1325 extern rtx gen_int_mode (HOST_WIDE_INT, enum machine_mode);
1326 extern rtx emit_copy_of_insn_after (rtx, rtx);
1327 extern void set_reg_attrs_from_mem (rtx, rtx);
1328 extern void set_mem_attrs_from_reg (rtx, rtx);
1329 extern void set_reg_attrs_for_parm (rtx, rtx);
1330 extern int mem_expr_equal_p (tree, tree);
1331
1332 /* In rtl.c */
1333 extern rtx rtx_alloc_stat (RTX_CODE MEM_STAT_DECL);
1334 #define rtx_alloc(c) rtx_alloc_stat (c MEM_STAT_INFO)
1335
1336 extern rtvec rtvec_alloc (int);
1337 extern rtx copy_rtx (rtx);
1338 extern void dump_rtx_statistics (void);
1339
1340 /* In emit-rtl.c */
1341 extern rtx copy_rtx_if_shared (rtx);
1342
1343 /* In rtl.c */
1344 extern rtx shallow_copy_rtx_stat (rtx MEM_STAT_DECL);
1345 #define shallow_copy_rtx(a) shallow_copy_rtx_stat (a MEM_STAT_INFO)
1346 extern int rtx_equal_p (rtx, rtx);
1347
1348 /* In emit-rtl.c */
1349 extern rtvec gen_rtvec_v (int, rtx *);
1350 extern rtx gen_reg_rtx (enum machine_mode);
1351 extern rtx gen_rtx_REG_offset (rtx, enum machine_mode, unsigned int, int);
1352 extern rtx gen_label_rtx (void);
1353 extern rtx gen_lowpart_common (enum machine_mode, rtx);
1354
1355 /* In cse.c */
1356 extern rtx gen_lowpart_if_possible (enum machine_mode, rtx);
1357
1358 /* In emit-rtl.c */
1359 extern rtx gen_highpart (enum machine_mode, rtx);
1360 extern rtx gen_highpart_mode (enum machine_mode, enum machine_mode, rtx);
1361 extern rtx operand_subword (rtx, unsigned int, int, enum machine_mode);
1362
1363 /* In emit-rtl.c */
1364 extern rtx operand_subword_force (rtx, unsigned int, enum machine_mode);
1365 extern int subreg_lowpart_p (rtx);
1366 extern unsigned int subreg_lowpart_offset (enum machine_mode,
1367 enum machine_mode);
1368 extern unsigned int subreg_highpart_offset (enum machine_mode,
1369 enum machine_mode);
1370 extern rtx make_safe_from (rtx, rtx);
1371 extern rtx convert_memory_address (enum machine_mode, rtx);
1372 extern rtx get_insns (void);
1373 extern const char *get_insn_name (int);
1374 extern rtx get_last_insn (void);
1375 extern rtx get_last_insn_anywhere (void);
1376 extern rtx get_first_nonnote_insn (void);
1377 extern rtx get_last_nonnote_insn (void);
1378 extern void start_sequence (void);
1379 extern void push_to_sequence (rtx);
1380 extern void end_sequence (void);
1381 extern rtx immed_double_const (HOST_WIDE_INT, HOST_WIDE_INT,
1382 enum machine_mode);
1383
1384 /* In loop-iv.c */
1385
1386 extern rtx lowpart_subreg (enum machine_mode, rtx, enum machine_mode);
1387
1388 /* In varasm.c */
1389 extern rtx force_const_mem (enum machine_mode, rtx);
1390
1391 /* In varasm.c */
1392
1393 struct function;
1394 extern rtx get_pool_constant (rtx);
1395 extern rtx get_pool_constant_mark (rtx, bool *);
1396 extern enum machine_mode get_pool_mode (rtx);
1397 extern rtx get_pool_constant_for_function (struct function *, rtx);
1398 extern rtx simplify_subtraction (rtx);
1399
1400 /* In function.c */
1401 extern rtx assign_stack_local (enum machine_mode, HOST_WIDE_INT, int);
1402 extern rtx assign_stack_temp (enum machine_mode, HOST_WIDE_INT, int);
1403 extern rtx assign_stack_temp_for_type (enum machine_mode,
1404 HOST_WIDE_INT, int, tree);
1405 extern rtx assign_temp (tree, int, int, int);
1406
1407 /* In emit-rtl.c */
1408 extern rtx emit_insn_before (rtx, rtx);
1409 extern rtx emit_insn_before_noloc (rtx, rtx);
1410 extern rtx emit_insn_before_setloc (rtx, rtx, int);
1411 extern rtx emit_jump_insn_before (rtx, rtx);
1412 extern rtx emit_jump_insn_before_noloc (rtx, rtx);
1413 extern rtx emit_jump_insn_before_setloc (rtx, rtx, int);
1414 extern rtx emit_call_insn_before (rtx, rtx);
1415 extern rtx emit_call_insn_before_noloc (rtx, rtx);
1416 extern rtx emit_call_insn_before_setloc (rtx, rtx, int);
1417 extern rtx emit_barrier_before (rtx);
1418 extern rtx emit_label_before (rtx, rtx);
1419 extern rtx emit_note_before (int, rtx);
1420 extern rtx emit_insn_after (rtx, rtx);
1421 extern rtx emit_insn_after_noloc (rtx, rtx);
1422 extern rtx emit_insn_after_setloc (rtx, rtx, int);
1423 extern rtx emit_jump_insn_after (rtx, rtx);
1424 extern rtx emit_jump_insn_after_noloc (rtx, rtx);
1425 extern rtx emit_jump_insn_after_setloc (rtx, rtx, int);
1426 extern rtx emit_call_insn_after (rtx, rtx);
1427 extern rtx emit_call_insn_after_noloc (rtx, rtx);
1428 extern rtx emit_call_insn_after_setloc (rtx, rtx, int);
1429 extern rtx emit_barrier_after (rtx);
1430 extern rtx emit_label_after (rtx, rtx);
1431 extern rtx emit_note_after (int, rtx);
1432 extern rtx emit_note_copy_after (rtx, rtx);
1433 extern rtx emit_insn (rtx);
1434 extern rtx emit_jump_insn (rtx);
1435 extern rtx emit_call_insn (rtx);
1436 extern rtx emit_label (rtx);
1437 extern rtx emit_barrier (void);
1438 extern rtx emit_note (int);
1439 extern rtx emit_note_copy (rtx);
1440 extern rtx emit_line_note (location_t);
1441 extern rtx make_insn_raw (rtx);
1442 extern void add_function_usage_to (rtx, rtx);
1443 extern rtx last_call_insn (void);
1444 extern rtx previous_insn (rtx);
1445 extern rtx next_insn (rtx);
1446 extern rtx prev_nonnote_insn (rtx);
1447 extern rtx next_nonnote_insn (rtx);
1448 extern rtx prev_real_insn (rtx);
1449 extern rtx next_real_insn (rtx);
1450 extern rtx prev_active_insn (rtx);
1451 extern rtx next_active_insn (rtx);
1452 extern int active_insn_p (rtx);
1453 extern rtx prev_label (rtx);
1454 extern rtx next_label (rtx);
1455 extern rtx skip_consecutive_labels (rtx);
1456 extern rtx next_cc0_user (rtx);
1457 extern rtx prev_cc0_setter (rtx);
1458
1459 /* In cfglayout.c */
1460 extern int insn_line (rtx);
1461 extern const char * insn_file (rtx);
1462 extern int locator_line (int);
1463 extern const char * locator_file (int);
1464 extern int prologue_locator, epilogue_locator;
1465
1466 /* In jump.c */
1467 extern enum rtx_code reverse_condition (enum rtx_code);
1468 extern enum rtx_code reverse_condition_maybe_unordered (enum rtx_code);
1469 extern enum rtx_code swap_condition (enum rtx_code);
1470 extern enum rtx_code unsigned_condition (enum rtx_code);
1471 extern enum rtx_code signed_condition (enum rtx_code);
1472 extern void mark_jump_label (rtx, rtx, int);
1473 extern void cleanup_barriers (void);
1474
1475 /* In jump.c */
1476 extern bool squeeze_notes (rtx *, rtx *);
1477 extern rtx delete_related_insns (rtx);
1478 extern void delete_jump (rtx);
1479 extern rtx get_label_before (rtx);
1480 extern rtx get_label_after (rtx);
1481 extern rtx follow_jumps (rtx);
1482
1483 /* In recog.c */
1484 extern rtx *find_constant_term_loc (rtx *);
1485
1486 /* In emit-rtl.c */
1487 extern rtx try_split (rtx, rtx, int);
1488 extern int split_branch_probability;
1489
1490 /* In unknown file */
1491 extern rtx split_insns (rtx, rtx);
1492
1493 /* In simplify-rtx.c */
1494 extern rtx simplify_const_unary_operation (enum rtx_code, enum machine_mode,
1495 rtx, enum machine_mode);
1496 extern rtx simplify_unary_operation (enum rtx_code, enum machine_mode, rtx,
1497 enum machine_mode);
1498 extern rtx simplify_const_binary_operation (enum rtx_code, enum machine_mode,
1499 rtx, rtx);
1500 extern rtx simplify_binary_operation (enum rtx_code, enum machine_mode, rtx,
1501 rtx);
1502 extern rtx simplify_ternary_operation (enum rtx_code, enum machine_mode,
1503 enum machine_mode, rtx, rtx, rtx);
1504 extern rtx simplify_const_relational_operation (enum rtx_code,
1505 enum machine_mode, rtx, rtx);
1506 extern rtx simplify_relational_operation (enum rtx_code, enum machine_mode,
1507 enum machine_mode, rtx, rtx);
1508 extern rtx simplify_gen_binary (enum rtx_code, enum machine_mode, rtx, rtx);
1509 extern rtx simplify_gen_unary (enum rtx_code, enum machine_mode, rtx,
1510 enum machine_mode);
1511 extern rtx simplify_gen_ternary (enum rtx_code, enum machine_mode,
1512 enum machine_mode, rtx, rtx, rtx);
1513 extern rtx simplify_gen_relational (enum rtx_code, enum machine_mode,
1514 enum machine_mode, rtx, rtx);
1515 extern rtx simplify_subreg (enum machine_mode, rtx, enum machine_mode,
1516 unsigned int);
1517 extern rtx simplify_gen_subreg (enum machine_mode, rtx, enum machine_mode,
1518 unsigned int);
1519 extern rtx simplify_replace_rtx (rtx, rtx, rtx);
1520 extern rtx simplify_rtx (rtx);
1521 extern rtx avoid_constant_pool_reference (rtx);
1522 extern bool mode_signbit_p (enum machine_mode, rtx);
1523
1524 /* In regclass.c */
1525 extern enum machine_mode choose_hard_reg_mode (unsigned int, unsigned int,
1526 bool);
1527
1528 /* In emit-rtl.c */
1529 extern rtx set_unique_reg_note (rtx, enum reg_note, rtx);
1530
1531 /* Functions in rtlanal.c */
1532
1533 /* Single set is implemented as macro for performance reasons. */
1534 #define single_set(I) (INSN_P (I) \
1535 ? (GET_CODE (PATTERN (I)) == SET \
1536 ? PATTERN (I) : single_set_1 (I)) \
1537 : NULL_RTX)
1538 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1539
1540 /* Structure used for passing data to REPLACE_LABEL. */
1541 typedef struct replace_label_data
1542 {
1543 rtx r1;
1544 rtx r2;
1545 bool update_label_nuses;
1546 } replace_label_data;
1547
1548 extern int rtx_addr_can_trap_p (rtx);
1549 extern bool nonzero_address_p (rtx);
1550 extern int rtx_unstable_p (rtx);
1551 extern int rtx_varies_p (rtx, int);
1552 extern int rtx_addr_varies_p (rtx, int);
1553 extern HOST_WIDE_INT get_integer_term (rtx);
1554 extern rtx get_related_value (rtx);
1555 extern int global_reg_mentioned_p (rtx);
1556 extern int reg_mentioned_p (rtx, rtx);
1557 extern int count_occurrences (rtx, rtx, int);
1558 extern int reg_referenced_p (rtx, rtx);
1559 extern int reg_used_between_p (rtx, rtx, rtx);
1560 extern int reg_set_between_p (rtx, rtx, rtx);
1561 extern int commutative_operand_precedence (rtx);
1562 extern int swap_commutative_operands_p (rtx, rtx);
1563 extern int modified_between_p (rtx, rtx, rtx);
1564 extern int no_labels_between_p (rtx, rtx);
1565 extern int modified_in_p (rtx, rtx);
1566 extern int reg_set_p (rtx, rtx);
1567 extern rtx single_set_2 (rtx, rtx);
1568 extern int multiple_sets (rtx);
1569 extern int set_noop_p (rtx);
1570 extern int noop_move_p (rtx);
1571 extern rtx find_last_value (rtx, rtx *, rtx, int);
1572 extern int refers_to_regno_p (unsigned int, unsigned int, rtx, rtx *);
1573 extern int reg_overlap_mentioned_p (rtx, rtx);
1574 extern rtx set_of (rtx, rtx);
1575 extern void note_stores (rtx, void (*) (rtx, rtx, void *), void *);
1576 extern void note_uses (rtx *, void (*) (rtx *, void *), void *);
1577 extern int dead_or_set_p (rtx, rtx);
1578 extern int dead_or_set_regno_p (rtx, unsigned int);
1579 extern rtx find_reg_note (rtx, enum reg_note, rtx);
1580 extern rtx find_regno_note (rtx, enum reg_note, unsigned int);
1581 extern rtx find_reg_equal_equiv_note (rtx);
1582 extern int find_reg_fusage (rtx, enum rtx_code, rtx);
1583 extern int find_regno_fusage (rtx, enum rtx_code, unsigned int);
1584 extern int pure_call_p (rtx);
1585 extern void remove_note (rtx, rtx);
1586 extern int side_effects_p (rtx);
1587 extern int volatile_refs_p (rtx);
1588 extern int volatile_insn_p (rtx);
1589 extern int may_trap_p (rtx);
1590 extern int inequality_comparisons_p (rtx);
1591 extern rtx replace_rtx (rtx, rtx, rtx);
1592 extern rtx replace_regs (rtx, rtx *, unsigned int, int);
1593 extern int replace_label (rtx *, void *);
1594 extern int rtx_referenced_p (rtx, rtx);
1595 extern bool tablejump_p (rtx, rtx *, rtx *);
1596 extern int computed_jump_p (rtx);
1597 typedef int (*rtx_function) (rtx *, void *);
1598 extern int for_each_rtx (rtx *, rtx_function, void *);
1599 extern rtx regno_use_in (unsigned int, rtx);
1600 extern int auto_inc_p (rtx);
1601 extern int in_expr_list_p (rtx, rtx);
1602 extern void remove_node_from_expr_list (rtx, rtx *);
1603 extern int insns_safe_to_move_p (rtx, rtx, rtx *);
1604 extern int loc_mentioned_in_p (rtx *, rtx);
1605 extern rtx find_first_parameter_load (rtx, rtx);
1606 extern bool keep_with_call_p (rtx);
1607 extern bool label_is_jump_target_p (rtx, rtx);
1608 extern int insn_rtx_cost (rtx);
1609
1610 /* Given an insn and condition, return a canonical description of
1611 the test being made. */
1612 extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int, int);
1613
1614 /* Given a JUMP_INSN, return a canonical description of the test
1615 being made. */
1616 extern rtx get_condition (rtx, rtx *, int, int);
1617
1618
1619 /* flow.c */
1620
1621 extern rtx find_use_as_address (rtx, rtx, HOST_WIDE_INT);
1622
1623 /* lists.c */
1624
1625 void free_EXPR_LIST_list (rtx *);
1626 void free_INSN_LIST_list (rtx *);
1627 void free_EXPR_LIST_node (rtx);
1628 void free_INSN_LIST_node (rtx);
1629 rtx alloc_INSN_LIST (rtx, rtx);
1630 rtx alloc_EXPR_LIST (int, rtx, rtx);
1631
1632 /* regclass.c */
1633
1634 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1635 Always at least 3, since the combiner could put that many together
1636 and we want this to remain correct for all the remaining passes. */
1637
1638 extern int max_parallel;
1639
1640 /* Free up register info memory. */
1641 extern void free_reg_info (void);
1642
1643 /* recog.c */
1644 extern int asm_noperands (rtx);
1645 extern const char *decode_asm_operands (rtx, rtx *, rtx **, const char **,
1646 enum machine_mode *);
1647
1648 extern enum reg_class reg_preferred_class (int);
1649 extern enum reg_class reg_alternate_class (int);
1650
1651 extern void split_all_insns (int);
1652 extern void split_all_insns_noflow (void);
1653
1654 #define MAX_SAVED_CONST_INT 64
1655 extern GTY(()) rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1656
1657 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1658 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1659 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1660 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1661 extern GTY(()) rtx const_true_rtx;
1662
1663 extern GTY(()) rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1664
1665 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1666 same as VOIDmode. */
1667
1668 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1669
1670 /* Likewise, for the constants 1 and 2. */
1671
1672 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1673 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1674
1675 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1676 is used to represent the frame pointer. This is because the
1677 hard frame pointer and the automatic variables are separated by an amount
1678 that cannot be determined until after register allocation. We can assume
1679 that in this case ELIMINABLE_REGS will be defined, one action of which
1680 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1681 #ifndef HARD_FRAME_POINTER_REGNUM
1682 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1683 #endif
1684
1685 /* Index labels for global_rtl. */
1686 enum global_rtl_index
1687 {
1688 GR_PC,
1689 GR_CC0,
1690 GR_STACK_POINTER,
1691 GR_FRAME_POINTER,
1692 /* For register elimination to work properly these hard_frame_pointer_rtx,
1693 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1694 the same register. */
1695 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1696 GR_ARG_POINTER = GR_FRAME_POINTER,
1697 #endif
1698 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1699 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1700 #else
1701 GR_HARD_FRAME_POINTER,
1702 #endif
1703 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1704 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1705 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1706 #else
1707 GR_ARG_POINTER,
1708 #endif
1709 #endif
1710 GR_VIRTUAL_INCOMING_ARGS,
1711 GR_VIRTUAL_STACK_ARGS,
1712 GR_VIRTUAL_STACK_DYNAMIC,
1713 GR_VIRTUAL_OUTGOING_ARGS,
1714 GR_VIRTUAL_CFA,
1715
1716 GR_MAX
1717 };
1718
1719 /* Pointers to standard pieces of rtx are stored here. */
1720 extern GTY(()) rtx global_rtl[GR_MAX];
1721
1722 /* Standard pieces of rtx, to be substituted directly into things. */
1723 #define pc_rtx (global_rtl[GR_PC])
1724 #define cc0_rtx (global_rtl[GR_CC0])
1725
1726 /* All references to certain hard regs, except those created
1727 by allocating pseudo regs into them (when that's possible),
1728 go through these unique rtx objects. */
1729 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1730 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1731 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1732 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1733
1734 extern GTY(()) rtx pic_offset_table_rtx;
1735 extern GTY(()) rtx static_chain_rtx;
1736 extern GTY(()) rtx static_chain_incoming_rtx;
1737 extern GTY(()) rtx return_address_pointer_rtx;
1738
1739 /* Include the RTL generation functions. */
1740
1741 #ifndef GENERATOR_FILE
1742 #include "genrtl.h"
1743 #ifndef USE_MAPPED_LOCATION
1744 #undef gen_rtx_ASM_OPERANDS
1745 #define gen_rtx_ASM_OPERANDS(MODE, ARG0, ARG1, ARG2, ARG3, ARG4, LOC) \
1746 gen_rtx_fmt_ssiEEsi (ASM_OPERANDS, (MODE), (ARG0), (ARG1), (ARG2), (ARG3), (ARG4), (LOC).file, (LOC).line)
1747 #endif
1748 #endif
1749
1750 /* There are some RTL codes that require special attention; the
1751 generation functions included above do the raw handling. If you
1752 add to this list, modify special_rtx in gengenrtl.c as well. */
1753
1754 extern rtx gen_rtx_CONST_INT (enum machine_mode, HOST_WIDE_INT);
1755 extern rtx gen_rtx_CONST_VECTOR (enum machine_mode, rtvec);
1756 extern rtx gen_raw_REG (enum machine_mode, int);
1757 extern rtx gen_rtx_REG (enum machine_mode, unsigned);
1758 extern rtx gen_rtx_SUBREG (enum machine_mode, rtx, int);
1759 extern rtx gen_rtx_MEM (enum machine_mode, rtx);
1760
1761 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (N))
1762
1763 /* Virtual registers are used during RTL generation to refer to locations into
1764 the stack frame when the actual location isn't known until RTL generation
1765 is complete. The routine instantiate_virtual_regs replaces these with
1766 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1767 a constant. */
1768
1769 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1770
1771 /* This points to the first word of the incoming arguments passed on the stack,
1772 either by the caller or by the callee when pretending it was passed by the
1773 caller. */
1774
1775 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1776
1777 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1778
1779 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1780 variable on the stack. Otherwise, it points to the first variable on
1781 the stack. */
1782
1783 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1784
1785 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1786
1787 /* This points to the location of dynamically-allocated memory on the stack
1788 immediately after the stack pointer has been adjusted by the amount
1789 desired. */
1790
1791 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1792
1793 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1794
1795 /* This points to the location in the stack at which outgoing arguments should
1796 be written when the stack is pre-pushed (arguments pushed using push
1797 insns always use sp). */
1798
1799 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1800
1801 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1802
1803 /* This points to the Canonical Frame Address of the function. This
1804 should correspond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1805 but is calculated relative to the arg pointer for simplicity; the
1806 frame pointer nor stack pointer are necessarily fixed relative to
1807 the CFA until after reload. */
1808
1809 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1810
1811 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1812
1813 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1814
1815 /* Nonzero if REGNUM is a pointer into the stack frame. */
1816 #define REGNO_PTR_FRAME_P(REGNUM) \
1817 ((REGNUM) == STACK_POINTER_REGNUM \
1818 || (REGNUM) == FRAME_POINTER_REGNUM \
1819 || (REGNUM) == HARD_FRAME_POINTER_REGNUM \
1820 || (REGNUM) == ARG_POINTER_REGNUM \
1821 || ((REGNUM) >= FIRST_VIRTUAL_REGISTER \
1822 && (REGNUM) <= LAST_VIRTUAL_REGISTER))
1823
1824 /* REGNUM never really appearing in the INSN stream. */
1825 #define INVALID_REGNUM (~(unsigned int) 0)
1826
1827 extern rtx output_constant_def (tree, int);
1828 extern rtx lookup_constant_def (tree);
1829
1830 /* Nonzero after the second flow pass has completed.
1831 Set to 1 or 0 by toplev.c */
1832 extern int flow2_completed;
1833
1834 /* Nonzero after end of reload pass.
1835 Set to 1 or 0 by reload1.c. */
1836
1837 extern int reload_completed;
1838
1839 /* Nonzero after thread_prologue_and_epilogue_insns has run. */
1840 extern int epilogue_completed;
1841
1842 /* Set to 1 while reload_as_needed is operating.
1843 Required by some machines to handle any generated moves differently. */
1844
1845 extern int reload_in_progress;
1846
1847 /* If this is nonzero, we do not bother generating VOLATILE
1848 around volatile memory references, and we are willing to
1849 output indirect addresses. If cse is to follow, we reject
1850 indirect addresses so a useful potential cse is generated;
1851 if it is used only once, instruction combination will produce
1852 the same indirect address eventually. */
1853 extern int cse_not_expected;
1854
1855 /* Set to nonzero before life analysis to indicate that it is unsafe to
1856 generate any new pseudo registers. */
1857 extern int no_new_pseudos;
1858
1859 /* Translates rtx code to tree code, for those codes needed by
1860 REAL_ARITHMETIC. The function returns an int because the caller may not
1861 know what `enum tree_code' means. */
1862
1863 extern int rtx_to_tree_code (enum rtx_code);
1864
1865 /* In cse.c */
1866 extern int delete_trivially_dead_insns (rtx, int);
1867 extern int cse_main (rtx, int, FILE *);
1868 extern void cse_condition_code_reg (void);
1869 extern int exp_equiv_p (rtx, rtx, int, bool);
1870 extern unsigned hash_rtx (rtx x, enum machine_mode, int *, int *, bool);
1871
1872 /* In jump.c */
1873 extern int comparison_dominates_p (enum rtx_code, enum rtx_code);
1874 extern int condjump_p (rtx);
1875 extern int any_condjump_p (rtx);
1876 extern int any_uncondjump_p (rtx);
1877 extern rtx pc_set (rtx);
1878 extern rtx condjump_label (rtx);
1879 extern int simplejump_p (rtx);
1880 extern int returnjump_p (rtx);
1881 extern int onlyjump_p (rtx);
1882 extern int only_sets_cc0_p (rtx);
1883 extern int sets_cc0_p (rtx);
1884 extern int invert_jump_1 (rtx, rtx);
1885 extern int invert_jump (rtx, rtx, int);
1886 extern int rtx_renumbered_equal_p (rtx, rtx);
1887 extern int true_regnum (rtx);
1888 extern unsigned int reg_or_subregno (rtx);
1889 extern int redirect_jump_1 (rtx, rtx);
1890 extern void redirect_jump_2 (rtx, rtx, rtx, int, int);
1891 extern int redirect_jump (rtx, rtx, int);
1892 extern void rebuild_jump_labels (rtx);
1893 extern rtx reversed_comparison (rtx, enum machine_mode);
1894 extern enum rtx_code reversed_comparison_code (rtx, rtx);
1895 extern enum rtx_code reversed_comparison_code_parts (enum rtx_code,
1896 rtx, rtx, rtx);
1897 extern void delete_for_peephole (rtx, rtx);
1898 extern int condjump_in_parallel_p (rtx);
1899 extern void purge_line_number_notes (rtx);
1900
1901 /* In emit-rtl.c. */
1902 extern int max_reg_num (void);
1903 extern int max_label_num (void);
1904 extern int get_first_label_num (void);
1905 extern void maybe_set_first_label_num (rtx);
1906 extern void delete_insns_since (rtx);
1907 extern void mark_reg_pointer (rtx, int);
1908 extern void mark_user_reg (rtx);
1909 extern void reset_used_flags (rtx);
1910 extern void set_used_flags (rtx);
1911 extern void reorder_insns (rtx, rtx, rtx);
1912 extern void reorder_insns_nobb (rtx, rtx, rtx);
1913 extern int get_max_uid (void);
1914 extern int in_sequence_p (void);
1915 extern void force_next_line_note (void);
1916 extern void init_emit (void);
1917 extern void init_emit_once (int);
1918 extern void push_topmost_sequence (void);
1919 extern void pop_topmost_sequence (void);
1920 extern void set_new_first_and_last_insn (rtx, rtx);
1921 extern void unshare_all_rtl (void);
1922 extern void unshare_all_rtl_again (rtx);
1923 extern void unshare_all_rtl_in_chain (rtx);
1924 extern void verify_rtl_sharing (void);
1925 extern void set_first_insn (rtx);
1926 extern void set_last_insn (rtx);
1927 extern void link_cc0_insns (rtx);
1928 extern void add_insn (rtx);
1929 extern void add_insn_before (rtx, rtx);
1930 extern void add_insn_after (rtx, rtx);
1931 extern void remove_insn (rtx);
1932 extern void emit_insn_after_with_line_notes (rtx, rtx, rtx);
1933 extern rtx emit (rtx);
1934 extern void renumber_insns (FILE *);
1935 extern void remove_unnecessary_notes (void);
1936 extern rtx delete_insn (rtx);
1937 extern rtx entry_of_function (void);
1938 extern void delete_insn_chain (rtx, rtx);
1939 extern rtx unlink_insn_chain (rtx, rtx);
1940 extern rtx delete_insn_and_edges (rtx);
1941 extern void delete_insn_chain_and_edges (rtx, rtx);
1942 extern rtx gen_lowpart_SUBREG (enum machine_mode, rtx);
1943 extern rtx gen_const_mem (enum machine_mode, rtx);
1944 extern bool validate_subreg (enum machine_mode, enum machine_mode,
1945 rtx, unsigned int);
1946
1947 /* In combine.c */
1948 extern int combine_instructions (rtx, unsigned int);
1949 extern unsigned int extended_count (rtx, enum machine_mode, int);
1950 extern rtx remove_death (unsigned int, rtx);
1951 extern void dump_combine_stats (FILE *);
1952 extern void dump_combine_total_stats (FILE *);
1953 /* In web.c */
1954 extern void web_main (void);
1955
1956 /* In sched-rgn.c. */
1957 extern void schedule_insns (FILE *);
1958
1959 /* In sched-ebb.c. */
1960 extern void schedule_ebbs (FILE *);
1961
1962 /* In haifa-sched.c. */
1963 extern void fix_sched_param (const char *, const char *);
1964
1965 /* In print-rtl.c */
1966 extern const char *print_rtx_head;
1967 extern void debug_rtx (rtx);
1968 extern void debug_rtx_list (rtx, int);
1969 extern void debug_rtx_range (rtx, rtx);
1970 extern rtx debug_rtx_find (rtx, int);
1971 extern void print_mem_expr (FILE *, tree);
1972 extern void print_rtl (FILE *, rtx);
1973 extern void print_simple_rtl (FILE *, rtx);
1974 extern int print_rtl_single (FILE *, rtx);
1975 extern void print_inline_rtx (FILE *, rtx, int);
1976
1977 /* In loop.c */
1978 extern void init_loop (void);
1979 extern void loop_optimize (rtx, FILE *, int);
1980
1981 /* In bt-load.c */
1982 extern void branch_target_load_optimize (bool);
1983
1984 /* In function.c */
1985 extern void reposition_prologue_and_epilogue_notes (rtx);
1986 extern void thread_prologue_and_epilogue_insns (rtx);
1987 extern int prologue_epilogue_contains (rtx);
1988 extern int sibcall_epilogue_contains (rtx);
1989 extern void mark_temp_addr_taken (rtx);
1990 extern void update_temp_slot_address (rtx, rtx);
1991
1992 /* In stmt.c */
1993 extern void expand_null_return (void);
1994 extern void expand_naked_return (void);
1995 extern void emit_jump (rtx);
1996
1997 /* In expr.c */
1998 extern rtx move_by_pieces (rtx, rtx, unsigned HOST_WIDE_INT,
1999 unsigned int, int);
2000
2001 /* In flow.c */
2002 extern void recompute_reg_usage (void);
2003 extern int initialize_uninitialized_subregs (void);
2004 extern void delete_dead_jumptables (void);
2005 extern void print_rtl_with_bb (FILE *, rtx);
2006 extern void dump_flow_info (FILE *);
2007
2008 /* In expmed.c */
2009 extern void init_expmed (void);
2010 extern void expand_inc (rtx, rtx);
2011 extern void expand_dec (rtx, rtx);
2012
2013 /* In gcse.c */
2014 extern bool can_copy_p (enum machine_mode);
2015 extern rtx fis_get_condition (rtx);
2016 extern int gcse_main (rtx, FILE *);
2017 extern int bypass_jumps (FILE *);
2018
2019 /* In postreload-gcse.c */
2020 extern void gcse_after_reload_main (rtx);
2021
2022 /* In global.c */
2023 extern void mark_elimination (int, int);
2024 extern int global_alloc (FILE *);
2025 extern void dump_global_regs (FILE *);
2026 #ifdef HARD_CONST
2027 /* Yes, this ifdef is silly, but HARD_REG_SET is not always defined. */
2028 extern void retry_global_alloc (int, HARD_REG_SET);
2029 #endif
2030 extern void build_insn_chain (rtx);
2031
2032 /* In regclass.c */
2033 extern int reg_classes_intersect_p (enum reg_class, enum reg_class);
2034 extern int reg_class_subset_p (enum reg_class, enum reg_class);
2035 extern void globalize_reg (int);
2036 extern void init_reg_modes_once (void);
2037 extern void init_regs (void);
2038 extern void init_fake_stack_mems (void);
2039 extern void init_reg_sets (void);
2040 extern void regclass_init (void);
2041 extern void regclass (rtx, int, FILE *);
2042 extern void reg_scan (rtx, unsigned int);
2043 extern void reg_scan_update (rtx, rtx, unsigned int);
2044 extern void fix_register (const char *, int, int);
2045 extern void init_subregs_of_mode (void);
2046 extern void record_subregs_of_mode (rtx);
2047 #ifdef HARD_CONST
2048 extern void cannot_change_mode_set_regs (HARD_REG_SET *,
2049 enum machine_mode, unsigned int);
2050 #endif
2051 extern bool invalid_mode_change_p (unsigned int, enum reg_class,
2052 enum machine_mode);
2053
2054 /* In regmove.c */
2055 extern void regmove_optimize (rtx, int, FILE *);
2056 extern void combine_stack_adjustments (void);
2057
2058 /* In reorg.c */
2059 extern void dbr_schedule (rtx, FILE *);
2060
2061 /* In local-alloc.c */
2062 extern void dump_local_alloc (FILE *);
2063 extern int local_alloc (void);
2064
2065 /* In reload1.c */
2066 extern int function_invariant_p (rtx);
2067
2068 /* In reg-stack.c */
2069 extern bool reg_to_stack (FILE *);
2070
2071 /* In calls.c */
2072 enum libcall_type
2073 {
2074 LCT_NORMAL = 0,
2075 LCT_CONST = 1,
2076 LCT_PURE = 2,
2077 LCT_CONST_MAKE_BLOCK = 3,
2078 LCT_PURE_MAKE_BLOCK = 4,
2079 LCT_NORETURN = 5,
2080 LCT_THROW = 6,
2081 LCT_RETURNS_TWICE = 7
2082 };
2083
2084 extern void emit_library_call (rtx, enum libcall_type, enum machine_mode, int,
2085 ...);
2086 extern rtx emit_library_call_value (rtx, rtx, enum libcall_type,
2087 enum machine_mode, int, ...);
2088
2089 /* In varasm.c */
2090 extern int in_data_section (void);
2091 extern void init_varasm_once (void);
2092
2093 /* In rtl.c */
2094 extern void traverse_md_constants (int (*) (void **, void *), void *);
2095 struct md_constant { char *name, *value; };
2096
2097 /* In read-rtl.c */
2098 extern int read_skip_spaces (FILE *);
2099 extern bool read_rtx (FILE *, rtx *, int *);
2100 extern void copy_rtx_ptr_loc (const void *, const void *);
2101 extern void print_rtx_ptr_loc (const void *);
2102 extern const char *join_c_conditions (const char *, const char *);
2103 extern void print_c_condition (const char *);
2104 extern const char *read_rtx_filename;
2105 extern int read_rtx_lineno;
2106
2107 /* In alias.c */
2108 extern void clear_reg_alias_info (rtx);
2109 extern rtx canon_rtx (rtx);
2110 extern int true_dependence (rtx, enum machine_mode, rtx, int (*)(rtx, int));
2111 extern rtx get_addr (rtx);
2112 extern int canon_true_dependence (rtx, enum machine_mode, rtx, rtx,
2113 int (*)(rtx, int));
2114 extern int read_dependence (rtx, rtx);
2115 extern int anti_dependence (rtx, rtx);
2116 extern int output_dependence (rtx, rtx);
2117 extern void mark_constant_function (void);
2118 extern void init_alias_once (void);
2119 extern void init_alias_analysis (void);
2120 extern void end_alias_analysis (void);
2121 extern bool memory_modified_in_insn_p (rtx, rtx);
2122 extern rtx find_base_term (rtx);
2123 extern rtx gen_hard_reg_clobber (enum machine_mode, unsigned int);
2124 extern rtx get_reg_known_value (unsigned int);
2125 extern bool get_reg_known_equiv_p (unsigned int);
2126
2127 #ifdef STACK_REGS
2128 extern int stack_regs_mentioned (rtx insn);
2129 #endif
2130
2131 /* In toplev.c */
2132 extern GTY(()) rtx stack_limit_rtx;
2133
2134 /* In regrename.c */
2135 extern void regrename_optimize (void);
2136 extern void copyprop_hardreg_forward (void);
2137
2138 /* In ifcvt.c */
2139 extern void if_convert (int);
2140
2141 /* In predict.c */
2142 extern void invert_br_probabilities (rtx);
2143 extern bool expensive_function_p (int);
2144 /* In tracer.c */
2145 extern void tracer (unsigned int);
2146
2147 /* In var-tracking.c */
2148 extern void variable_tracking_main (void);
2149
2150 /* In stor-layout.c. */
2151 extern void get_mode_bounds (enum machine_mode, int, enum machine_mode,
2152 rtx *, rtx *);
2153
2154 /* In loop-unswitch.c */
2155 extern rtx reversed_condition (rtx);
2156 extern rtx compare_and_jump_seq (rtx, rtx, enum rtx_code, rtx, int, rtx);
2157
2158 /* In loop-iv.c */
2159 extern rtx canon_condition (rtx);
2160 extern void simplify_using_condition (rtx, rtx *, struct bitmap_head_def *);
2161
2162 /* In ra.c. */
2163 extern void reg_alloc (void);
2164
2165 /* In modulo-sched.c. */
2166 extern void sms_schedule (FILE *);
2167 \f
2168 struct rtl_hooks
2169 {
2170 rtx (*gen_lowpart) (enum machine_mode, rtx);
2171 rtx (*gen_lowpart_no_emit) (enum machine_mode, rtx);
2172 rtx (*reg_nonzero_bits) (rtx, enum machine_mode, rtx, enum machine_mode,
2173 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT *);
2174 rtx (*reg_num_sign_bit_copies) (rtx, enum machine_mode, rtx, enum machine_mode,
2175 unsigned int, unsigned int *);
2176
2177 /* Whenever you add entries here, make sure you adjust hosthooks-def.h. */
2178 };
2179
2180 /* Each pass can provide its own. */
2181 extern struct rtl_hooks rtl_hooks;
2182
2183 /* ... but then it has to restore these. */
2184 extern const struct rtl_hooks general_rtl_hooks;
2185
2186 /* Keep this for the nonce. */
2187 #define gen_lowpart rtl_hooks.gen_lowpart
2188
2189 #endif /* ! GCC_RTL_H */
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